External antennae for Cell C LTE on Huawei B618

[LegionECX]

Hi Folks,
What is a good connector and external antennae I can use to boost the incoming signal to my Huawei B618 router running Cell C LTE?

 

[agentrfr]

1x

https://otto-wireless-solutions.myshopify.com/collections/gsm-hspa-lte/products/lte-3g-4g-mimo-omnidirectional-mimo-ottenna-6-db-with-5-meter-cables-lte-mo-6

2x

https://otto-wireless-solutions.myshopify.com/collections/crc9-ts9-etc/products/ts9-plug-to-sma-female-adapter-ts9-sma-adaptor